Question 670Steam Plants - Assistant Engineer

The correct answer is C) Sentinel valve. A sentinel valve is a safety device found on the casing of a steam turbine used for main propulsion on a vessel. Its purpose is to prevent the buildup of excessive pressure within the turbine casing in the event of a malfunction or failure. If the pressure rises above a safe level, the sentinel valve will automatically open to release the excess pressure and protect the turbine. The other options are not found on a steam turbine casing. The HP turbine bypass valve, sliding beam, and duplex set of relief valves are associated with other types of machinery and systems, not specifically the steam turbine casing.